Car pass other information and codes question

Another general question now I've managed to do 2 stereo's and a GID I'm getting the hang of it.

Question is, I read a GID and a CD30 MP3 off of a Corsa D, and got the same security code, including the correct vin number from the GID, The code I'm getting say's security code, but is the key number and radio code different? Just I see from reference car pass photo's that the key and radio code is never the same as the security code, are these two codes needed and for what and can you retrieve them if they are needed? I was assuming that you could retrieve the code for the stereo at least, just checking what you can and can't do, and what is and isn't needed.

Also some car passes mention an immobiliser code? is this needed and if so for what?

Using the Astra Range as an example, but applies to other cars in the same age bracket.

Astra G - Separate radio code and immobiliser code (Security Code)
Astra H - One single code for security, immobiliser, radio, basically everything in the car
Astra J - One single security code for BCM, IPC and probably other things, but modules do a VIN check for security check not security code.
Astra K - No car pass at all is provided, has to be done online and it gets the code off the server and auto inputs it.

Thanks for the Reply Pecky, on that score what would be the score with the following vehicles, been the ones I mainly deal in.

Corsa C an D variant.
Vectra C Assuming same as Astra H
Zafira B Asumming same as Astra H
Meriva A and B Assuming same as age of corsa
And finally the Insignia, I'm assuming this may be the same as the Astra J but not sure if you've done much on them yet.

Corsa C is the same as Astra G
Corsa D is same as Astra H
Vectra C depends on age i.e full or half can
Meriva, I think you are correct
Insignia, is one code for whole car, but uses VIN checks for security.

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This site was created by Pecky to act as a knowledge base of useful information regarding Vauxhall cars.
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